Angle of rotation: limited on both sides by adjustable, mechanical end stops. The actuator is protected against overload, requires no limit switches and stops automatically when the end stop is reached

Mounting

Set minimum and maximum flow rates by setting the mechanical end stops of the servomotor according to the scale

To be inserted at both sides into a round duct and to be equipped with a silencer if necessary

Horizontal or vertical mounting

Accessories

Insulation shells available upon request

Text for tender

The regulation of the airflow of the duct network is done by means of motorized valves for constant air volume control for Vmin - Vmax switching. The round controlvalves are constructed from a galvanized steel laser welded tunnel in which an aluminum control valve with rotating blade is incorporated. It controls the airflow with a constant flow rate within an operating range between 50Pa and 1000Pa. The regulator is resistant to varying pressures in the duct and is provided with an airtight maintenance-free bearing made of PTFE. The air flow rate is preset at the factory, but can be adjusted manually. The calibrated scale outside the regulator allows very accurate adjustment of the flow. The valves are available in duct diameters 80, 100, 125, 150, 160, 200, 250, 315, 355 and 400. The control valves are mounted between 2 channels where a rubber double lip seal provides an air-tight connection to air-tightness class D with the duct.

Cairox Type VRS-M

The regulation of the airflow of the duct network is done by means of motorized valves for constant air volume control for Vmin - Vmax switching. The round controlvalves are constructed from a galvanized steel laser welded tunnel in which an aluminum control valve with rotating blade is incorporated. It controls the airflow with a constant flow rate within an operating range between 50Pa and 1000Pa. The regulator is resistant to varying pressures in the duct and is provided with an airtight maintenance-free bearing made of PTFE. The air flow rate is preset at the factory, but can be adjusted manually. The calibrated scale outside the regulator allows very accurate adjustment of the flow. The valves are available in duct diameters 80, 100, 125, 150, 160, 200, 250, 315, 355 and 400. The control valves are mounted between 2 channels where a rubber double lip seal provides an air-tight connection to air-tightness class D with the duct.

Cairox Type VRS-M

Order example

VRS-M, 125, 24V

Explanation

VRS-M= Type of constant air valve

125 = Duct diameter

24V = With actuator CM24-L (24V)

Other available products

Stainless steel models available on request

Dimensions

VRS-M

ØD [mm]

L1 [mm]

L2 [mm]

A1 [mm]

B1 [mm]

80

79

140

40

158

105

100

99

170

40

158

105

125

124

170

40

158

105

150

149

240

40

158

105

160

159

240

40

158

105

200

199

240

40

158

105

250

249

240

40

158

105

315

314

225

60

158

105

355

354

295

60

158

105

400

398

295

60

158

105

Sound data

Ø

v [m/s]

Q [m³/h]

Lw [dB/Oct] - 100 Pa

Lw(A)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

2.2

40

37

37

35

33

33

33

28

27

38

4.5

82

49

47

44

41

39

39

33

32

45

6.9

125

52

51

48

45

44

44

38

37

49

100

2.5

70

40

39

38

36

35

36

30

29

41

4.8

135

50

48

45

42

41

40

34

33

46

7.1

200

54

52

49

47

45

45

39

38

51

125

2.3

100

41

40

38

36

35

36

30

29

41

4.3

190

51

49

46

42

41

40

34

32

46

6.3

280

54

53

50

47

45

45

39

37

50

140

2.7

150

43

42

40

38

37

37

31

30

42

4.9

270

53

51

47

44

43

42

36

34

48

7.2

400

56

55

52

49

47

47

41

39

52

150

2.4

150

43

42

40

38

37

37

31

30

42

4.2

270

52

50

46

43

41

41

34

33

47

6.3

400

56

54

50

47

46

45

39

38

51

160

2.5

180

44

43

41

39

38

38

32

31

43

4.7

340

53

51

48

44

43

42

36

34

48

6.9

500

57

55

52

49

47

47

40

39

52

200

2.2

250

45

43

41

39

38

37

31

30

43

5.1

575

55

53

50

46

44

44

37

36

50

8

900

-

-

-

-

-

-

-

-

-

250

2.8

500

48

47

45

43

41

41

35

34

47

5.7

1000

57

55

52

49

47

46

39

38

52

8.5

1500

-

-

-

-

-

-

-

-

-

315

2.9

800

48

46

44

41

39

39

32

31

44

5

1400

57

55

52

48

46

45

39

37

51

7.8

2200

-

-

-

-

-

-

-

-

-

355

2.5

900

50

48

46

43

42

41

35

33

47

5.6

2000

59

57

53

50

48

47

40

39

53

9

3200

-

-

-

-

-

-

-

-

-

400

2.2

1000

50

48

45

42

41

40

33

31

46

4.9

2200

58

56

52

49

47

46

39

37

52

8.4

3800

-

-

-

-

-

-

-

-

-

Ø

v [m/s]

Q [m³/h]

Lw [dB/Oct] - 250 Pa

Lw(A)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

2.2

40

39

42

43

44

44

46

41

41

50

4.5

82

51

51

50

49

48

49

44

44

54

6.9

125

61

60

57

54

53

53

47

46

58

100

2.5

70

43

45

46

46

47

49

44

43

53

4.8

135

59

57

54

51

50

49

43

42

55

7.1

200

63

61

58

55

54

54

48

47

59

125

2.3

100

45

47

47

48

48

49

44

43

54

4.3

190

55

54

53

51

51

51

46

45

56

6.3

280

63

61

58

55

54

53

47

46

59

140

2.7

150

47

49

49

49

50

51

46

45

55

4.9

270

61

59

56

53

51

51

44

43

57

7.2

400

65

63

60

57

56

55

49

48

61

150

2.4

150

47

49

49

49

50

51

45

44

55

4.2

270

56

56

54

52

52

52

46

46

57

6.3

400

64

62

59

56

54

54

48

46

60

160

2.5

180

48

50

50

50

50

51

46

45

56

4.7

340

62

60

56

53

51

51

44

43

57

6.9

500

66

64

61

58

56

55

49

48

61

200

2.2

250

51

52

52

51

51

51

45

44

56

5.1

575

64

62

58

55

53

53

46

45

59

8

900

68

66

63

60

58

58

52

50

64

250

2.8

500

54

56

55

55

54

55

49

48

60

5.7

1000

66

64

61

57

55

55

48

47

61

8.5

1500

70

68

65

62

60

60

53

52

65

315

2.9

800

55

56

55

54

53

53

46

44

58

5

1400

66

64

60

57

55

54

47

46

60

7.8

2200

71

69

65

62

60

59

53

51

65

355

2.5

900

57

58

57

56

55

55

49

47

60

5.6

2000

68

66

62

59

57

56

49

47

62

9

3200

73

71

67

64

62

61

55

54

68

400

2.2

1000

58

59

57

56

55

54

47

45

59

4.9

2200

67

65

61

57

55

54

48

46

61

8.4

3800

73

71

67

64

62

61

55

53

67

Ø

v [m/s]

Q [m³/h]

Lw [dB/Oct] - 500 Pa

Lw(A)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

2.2

40

46

49

49

50

51

53

48

48

57

4.5

82

58

58

56

55

55

56

51

51

61

6.9

125

68

66

63

61

59

59

53

52

65

100

2.5

70

49

52

52

53

54

55

50

50

60

4.8

135

60

60

58

57

57

58

53

52

63

7.1

200

70

68

65

62

61

60

54

53

66

125

2.3

100

52

54

54

54

55

56

50

49

60

4.3

190

61

61

59

58

57

58

52

52

63

6.3

280

64

64

62

61

61

62

57

56

67

140

2.7

150

53

56

56

56

56

58

52

51

62

4.9

270

63

63

61

60

59

60

54

54

65

7.2

400

72

70

67

64

62

62

56

55

68

150

2.4

150

54

56

56

56

56

57

52

51

62

4.2

270

63

62

60

59

58

59

53

52

64

6.3

400

65

65

64

62

62

63

57

57

68

160

2.5

180

55

57

57

57

57

58

53

51

63

4.7

340

64

64

62

60

60

60

55

54

65

6.9

500

72

70

67

64

62

62

56

54

68

200

2.2

250

57

59

58

58

57

58

52

50

63

5.1

575

66

66

64

62

62

62

56

56

67

8

900

75

73

70

67

65

65

58

57

70

250

2.8

500

61

62

62

61

61

62

56

54

66

5.7

1000

69

68

67

65

64

64

59

58

69

8.5

1500

77

75

72

68

67

66

60

58

72

315

2.9

800

62

63

62

61

60

59

53

51

65

5

1400

70

69

67

65

64

64

58

57

69

7.8

2200

77

75

72

69

67

66

60

58

72

355

2.5

900

64

65

64

63

62

62

55

53

67

5.6

2000

72

71

69

67

66

66

60

59

71

9

3200

79

77

74

71

69

68

62

60

74

400

2.2

1000

65

65

64

62

61

61

54

51

66

4.9

2200

72

71

68

66

65

65

59

57

70

8.4

3800

79

77

74

70

68

68

61

60

74

Symbols and specifications

Q [m³/h] = Air volume in m³/h

Ø = Duct diameter in mm

100Pa, 250Pa of 500Pa = Static pressure in Pa

Lw (0m (int.)) = Generated sound power in the duct divided into dB per octave band at 0 m

Lw ext. duct L = 6m = The radiated sound of a duct with a length of 6 m expressed as Lw in dB

Radiated sound data

Ø

ΔLw [dB/Oct] - non insulated duct

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

36

33

32

23

17

12

11

11

100

34

32

30

22

16

12

11

10

125

29

29

31

24

21

19

15

11

140

27

28

27

21

18

14

12

10

150

25

25

23

19

14

12

11

9

160

23

23

20

18

11

10

9

8

200

22

19

16

16

15

11

9

8

250

19

16

13

12

12

10

9

8

315

18

14

12

13

11

11

8

8

355

17

12

11

11

10

10

7

7

400

17

11

10

10

10

9

7

6

Ø

ΔLw [dB/Oct] - insulated duct (25mm)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

39

35

39

35

32

33

34

29

100

38

35

38

34

31

33

34

28

125

35

33

37

36

32

33

36

27

140

29

29

32

32

32

33

33

26

150

28

27

30

30

29

32

32

25

160

27

26

28

29

27

31

31

25

200

23

18

23

26

29

29

29

24

250

23

18

20

24

26

30

28

24

315

22

17

19

23

27

29

28

24

355

20

15

18

22

26

28

27

23

400

19

14

17

22

25

28

27

23

Ø

ΔLw [dB/Oct] - insulated duct (50mm)

63Hz

125Hz

250Hz

500Hz

1kHz

2kHz

4kHz

8kHz

80

42

37

45

46

47

54

56

47

100

41

38

46

45

47

54

57

47

125

35

36

42

48

51

60

58

45

140

31

30

37

42

45

52

54

44

150

30

29

36

41

44

51

54

44

160

29

28

35

40

44

51

54

44

200

26

22

29

37

42

51

53

43

250

25

20

26

35

41

50

52

42

315

26

18

26

38

42

51

53

45

355

23

17

24

35

40

49

51

42

400

20

16

23

33

39

48

50

40

LW2 = LW - ΔLWLW2 = Case radiated noise in dB

LW = Sound power given for the frequencies f[Hz] from 63 up to 8000 Hz